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Transactions With Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $)
3 Months Ended 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Related Party Transaction [Line Items]        
General and administrative expense $ 10,902,000us-gaap_GeneralAndAdministrativeExpense $ 16,860,000us-gaap_GeneralAndAdministrativeExpense $ 45,169,000us-gaap_GeneralAndAdministrativeExpense $ 47,749,000us-gaap_GeneralAndAdministrativeExpense
Ferrellgas, L.P. [Member]        
Related Party Transaction [Line Items]        
General and administrative expense 10,902,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
16,860,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
45,169,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
47,749,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
Compensation And Benefits [Member]        
Related Party Transaction [Line Items]        
Operating expense 53,155,000us-gaap_OperatingExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
55,458,000us-gaap_OperatingExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
163,417,000us-gaap_OperatingExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
165,028,000us-gaap_OperatingExpenses
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
General and administrative expense 5,394,000us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
9,233,000us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
20,059,000us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
24,334,000us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
Compensation And Benefits [Member] | Ferrellgas, L.P. [Member]        
Related Party Transaction [Line Items]        
Operating expense 53,155,000us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
55,458,000us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
163,417,000us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
165,028,000us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
General and administrative expense $ 5,394,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
$ 9,233,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
$ 20,059,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember
$ 24,334,000us-gaap_GeneralAndAdministrativeExpense
/ dei_LegalEntityAxis
= fgp_FerrellgasLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fgp_CompensationAndBenefitsMember